package engine.query;
import compiler.absyn.*;

public interface Scan {
	
	
	public void     beforeFirst();
	
	
	public boolean  next();
	
	
	public void     close();
	
	
	public Constant getVal(String fldname);
	
	
	public int      getInt(String fldname);

	
	public String   getString(String fldname);
	
	public boolean  hasField(String fldname);
}
